氮肥施用时期及用量对水稻生长和产量的影响

目的]为氮肥的合理利用提供科学依据。方法]以新两优6号为试材,采取田间小区试验方法,在施用等量氮肥的条件下,共设7组处理,研究氮肥施用时期及用量对水稻生长和产量的影响。结果]基肥施氮比例过高,促进水稻前期的生长特别是地上部分的生长,容易导致营养生长过旺;增加分蘖肥和穗肥的比例,可以促进水稻后期生长,保持根系的活力和提高根系的总量,能够使水稻营养生长和生殖生长均衡发展;降低基施氮肥比例,增加分蘖肥和穗肥比例,能够满足水稻生长后期对养分的需求,每穗实粒数、千粒重增加,水稻产量提高。结论]在沿巢湖流域坡岗地区,以处理⑦（30%氮肥作基肥＋30%氮肥作分蘖肥＋40%氮肥作穗肥）产量最高。

The Effect of Nitrogen Application Stage and Amount on Growth and Yield of Rice

Objective]The study aimed to provide the references on nitrogen rational utilization.Method]With the Xinliangyou NO.6 as test material,took field plot as the method,set up 7 treatments,the effects of nitrogen application stage and amount on growth and yield of rice were studied in the conditions of equivalent nitrogen.Result]There was a rapid growth in early growth and overground part,and it was easy to make vigorous vegetative growth when base fertilizer proportion was too high;higher tillering fertiliz...